MACRO LENS SYSTEM AND IMAGING APPARATUS

摘要

A macro lens system includes, in this order from an object side: a positive first lens group; a negative second lens group; a positive third lens group; a negative fourth lens group; a positive fifth lens group; and a negative sixth lens group. The first lens group is constituted by three lenses. The second lens group, the fourth lens group, and the fifth lens group are independently moved in the direction of the optical axes thereof when focusing from an object at infinity to an object at a most proximate distance. The second lens group moves toward the image side and the fourth lens group moves toward the object side when focusing from an object at infinity to an object at a most proximate distance.

主权项

1. A macro lens system, consisting essentially of, in this order from an object side:
a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a negative refractive power; a fifth lens group having a positive refractive power; and a sixth lens group having a negative refractive power; further comprising: a stop which is fixed during focusing operations provided between the surface of the second lens group toward the image side and the surface of the fourth lens group toward the object side; characterized by: the second lens group, the fourth lens group, and the fifth lens group being independently moved in the direction of the optical axes thereof when focusing from an object at infinity to an object at a most proximate distance; and the second lens group moving toward the image side and the fourth lens group moving toward the object side when focusing from an object at infinity to an object at a most proximate distance.